I have the same issue and could not solve it whatever I did. It used to fetch or normal last month. Now I get the error “no card found”.
My site is https://huglero.com
Anyone has a solution for this? My last 3 posts are without a thumbnail and doesn’t attract anyone at all.

I got another email from Azure team: “As discussed in previous mails, as the CDN Endpoint is working as expected in all the browsers and delivering the required content and Since the custom domain endpoint is not working as expected this should be further analyzed by the Twitter team /DNS provider.”

I’m going to contact DNS provider again. But I have to give them a way to reproduce the issue. We need to know how Twitter send the request. Because, the CDN responses well in any other situations like browser, CURL, facebook, and Google.

I tested accessing the CDN by another domain and DNS provider. It doesn’t fetch the image from another domain with another DNS provider with CNAME to the CDN. So, I’m %100 percent sure it’s not an issue with DNS provider.
I contacted Microsoft support again but they checked again and told:
“The issue seems to be a problem with Twitter on how the DNS resolution is being done. And also we see that the expected result has been achieved when browsed in any other browsers.”

I just did several DNS tests by several tools and there the DNS resolution works fine by them. I just found that Twitter uses Netty for DNS resolution and the error you sent me “status:UnresolvedAddress” comes from Netty.

It seems there is an issue (or conflict with our DNS settings) in your DNS resolution software implemented with Netty. Mind you report it to your development team to help or find a solution for it?

Hi @farsad_gh I was on vacation for a while - apologies for the delayed follow-up. I’ve already reported this, but there’s no guarantee that our team will be prioritising a fix for a specific individual URL, I’m afraid. Sorry for the inconvenience. As mentioned before, I don’t have anything additional to report at this time.